Which statement correctly defines Medicare Part B?

Medicare Part B is designed to cover a range of outpatient and physician services. This includes medically necessary physician services, preventive services, hospital outpatient care, certain home health services, durable medical equipment, and diagnostic tests. The emphasis on outpatient care distinguishes Part B from Part A, which primarily covers inpatient hospital services. Understanding this distinction helps clarify the broader scope that Part B has in providing essential healthcare services outside of hospital settings.

The other statements do not accurately reflect the nature of Medicare Part B. For instance, coverage is not limited to only hospital inpatient care, nor is it mandatory for all individuals over 65, as enrollment can be voluntary and may depend on other factors such as work history. Moreover, Part B includes various types of diagnostic testing, so it cannot be said to exclude these services entirely. Recognizing the comprehensive nature of Part B highlights its vital role in outpatient healthcare management for Medicare beneficiaries.